(1) the phenomenon of the leakage of the piston ring

(1) the sound of serious leakage is similar to that of "knocking".

2. When you listen to the oil inlet, the noise is very clear, and there is a lot of gas coming out. If the oil cover is covered, the noise will obviously weaken.

(2) cause

The leakage of V3 piston ring is mostly happened in the early and late stage of engine piston ring replacement. The reason is that the elastic force of the piston ring is too small or the cylinder wall has grooves, the quality of the piston ring is not good or the piston is lost, the gap between the piston ring port is too large or the piston ring is stuck in the ring groove.

(3) examination and diagnosis

Listen to the oil inlet and hear the noise when the engine is running high. After the fire of a cylinder, the noise and the smoke disappear immediately. Then it can be preliminarily identified that the cylinder has air leakage, then the spark plug is removed, a little oil is poured into the engine, then the spark plug of the V3 fittings in the north is installed, and the engine is started. In a short time, if the sound disappears or weakens, it can be identified as the leakage sound of the cylinder.

After the engine is replaced by the piston ring, the slight channeling noise caused by incomplete grinding can be gradually eliminated, which is allowed to exist. If the noise is serious, it should be found out to avoid the long-term influence on the power and economy of the V3 parts engine, especially for the cylinder. The sound of air leakage must be eliminated in time.